And ugh, Tornado Outbreak has two very difficult trophies, which might raise the difficulty from 2 stars to 3. First trophy is the collect 100 Fire Flyers all at once one, which is difficult because there are only 100 in a stage, so you have to be perfect (and it pretty much requires planning and some luck).
The other trophy involves unlocking all bonus content, which is definitely a feat in itself. You need to collect all 100 Flyers on each stage, as well as collect two sets of collectibles (they aren't hard if you can find them), get a perfect in the Vortex Race (not too hard), plus get a gold medal in your overall score (the hardest part). To get the qualifying scores (game doesn't tell you), you'll need to do some pretty high combos with the Fire Flyers.
Overall, though, the game isn't too hard apart from those two trophies. I only need like 4-5 more trophies before I get the platinum, although it might take me a while to get the bonus content trophy.